heat economizer



June 18, 1929. c, N, LUSH 1.717.715

HEAT ECONOMIZER Filed Feb. 3, 1928 2 Sheets-Sheet l Imfeptor a I CNJJLSP) June 18, 1929. c. N. LUSH HEAT ECONOMIZER Filed Feb. 3, 1928 3,SheetsSheet 2 Patented June 18, 1929.

UNITED STATES oLns'roRn 1v. LUSH, or wmmrne, MANITOBA, cA AnAl HEAT noonoMizER.

Application filed February 3, 1928. Serial No. 251,683.,

The invention relates to improvements in heat economizers and more particularly to a, device for use in connection with a hot air heater such as a hot air furnace and an object of the invention is to provide a device which can beireadily installed on existing hot air furnaces and which will permit of the effective utilizing of heat customarily wasted in the stack or chimney and which device addsin no wayto the operating costs of the furnace. a o

A further object of the invention is to pro vide a device inserted in the smoke pipe and entering the air'heating chamber of the furnace in a location abovethe domeand which is constructed when desired to circulate the waste gases through the air chamber to permit them to giveoff their heat in passage and in so doing materiallyincrease the efficiency of the furnace asa heating unit.

A further object is to construct the so that the products ofcombustion can be passed directly to the chimney iffClGSlIGd such thefire. q o a v a I. A further f object of the invention is to construct the appliance so that it can be in stalled in existing types of furnaceswithout requiring to make any material change I in the furnace structure. y A furtherobject of the invention is to construct the device in a simple, durable and inexpensive manner and so that it can be readily cleaned as j occasion demands.

With the above more important objects in view, the invention consists essentially in the arrangement andconstruction of parts hereinafter more particularly described, reference being had to the accompanying drawings, in which:

Fig- 1 is a side view of the device asinstalledin a furnace, the upper portion of the furnace being'shown in vertical section.

as is required when initiallystarting Fig. 2 is a horizontal sectional view at 2* 2' Figure 1.

Fig. 3 is a perspective view ofthe appliance, parts being broken away to expose interior construction. o a I t Fig. 4 is an enlarged detailed vertical sectional view at HFigure 3. l

F ig.'5 is a'perspectivc view of a'portion of one of thetubes. o In the drawings like characters of reference indicate corresponding parts: in the several figures.

r The furnace herein shown is the customary pi pes7 device one there below.

hot air furnace and embodies the fire box 1,

ash pit 2,-co1nbustion the aforesald an outer casing 5, the outcr casing being chamber 3 and dome 4,

parts being contained within spaced from the aforesaid parts to provide an air heatingchamber 6 surrounding and 1 about the combustion chamber. Heating casingand cold air, admission pipes 8 lead to the bottom of the casing. A smok passes from the-combustion chamber out the back ofthe'outer casing and is connected to a flue pipe 10. Anash door 11' opensto the fire door 12 opens through the.

ash pit and a combustion chamber to the'fire box. 'The outercasing is usually made from a number of sheet metal rings 'which can be stacked one on topof' the other, this being for convenience in'setti'ng' the furnace up in a base m'ent.

lead from the upper partof the outer The parts hereinbefore described are in common use and form no part of my invention; o \jV hen it is desi'redto install invention, I lift off the uppermost-section or ring of and then replace the the economizer which The economizer is now described in detail.

'Acircular ring or bandj'l3 is supplied which is of the same A casing, as the band in the furnace to takea position between the uppermost furnace casing section and the In other words when I insert my device, I first remove the upper section or ring of the furnace, then place my ring in the position which the top section previously the top section ring or band13.

The ring or band 13 carries two 'diam'etri callv opposing head plates v14 andl5 and these head plates are connected bya pluralopening through the'head plates. The ends of the tubes must make aigas tight joint with the head "plates; ure 1, it will be seen that there are several occupied and then remoun t of the furnace on top of the 'By observing Figthe furnace and insert my heat economize! i r upper ring on top of 1s built to receive it.

diameter as the outer is adapted when installed ity of similar tubes 16 which have their ends v horizontal rows of tubes and that the tubes I take a position crossing the air'chamber 6 in a location directly'above the dome of the I Adjoining the head 3 combustion chamber.

15, I form a closed passageway 17 connecting the ends oft-he tubes and hinged doors 18 and 19 are supplied to give entrance to the passageway from the exterior of the furnace.

Suitable means indicated at is provided for releasably fastening the doors closed and the arrangement is such'that one can readily approach-the tubesfor cleaning purposes'by opening the doors as will readily a partition 22 and has a further horizontal partition 23 therein. These partitions provide an entry compartment 26-, an intermedi ate compartment 27 and anioutlet compartment25. The vertical partition 22 extends inwardly fromthe outer side of the box to the headplatelet and serves to separate or divide'th etubes into two series, one series of tubes havingtheir rear. ends communicating with the compartment and the other series having their rear endscommunicating with thecompartment 27. Here it will be observed that the compartment 26 is not in direct communication. with they tubes.

The lower endof the partition 22 is provided with a hole or passage 28 connecting the compartment '26'wit-h that 25; and the f partition 23 is suppliedwith a hole or pas,-

the compartment 25 andone or otherof sage 29 connecting the compartment 26 with that27; Adamperrod 30 is suitably rotatably mountedin the. upper inner corner I of the compartment 26 and carries a damper 31, which upon. rotation ofthe damper rod' can be broughttopositionssuch that it will close the. passage 28 or that 29 as selected.v

The compartment 26 is provided with an inlet passage 32 and when the device is installed on a furnace, thisupassage communicates witlr the pipe 10 hereinbefore described. V i

Two outlet passages 33and 34 lead from thesecanbe' used to connect with that part of the smoke pipe leading to the chimney dependingon which is the more convenient.

leading from the device to the chimney is shown as connected to the outlet 33 and the outlet 34-is shown as closed by a cap 36.

WVith such an arran ement one can remove the cap'in order to clean out soot or other accumulation in the compartment 25. The

- end' ofthe box 21 remote from the compartment 25 is supplied with a clean out door37 and the section 35 of the smoke pipe is providedlwith a check damper 38. ,The tubes are provided with a plurality of fins 39 of any approved design.

According to they above construction, it willbea'pparent that the tubesjcan be readily cleaned by passing the customary furnace brush through them, the tubes "being readily entered afterthe doors 18. and 19 have been openjedfj- Any deposit, in the tubes which may be brushed into the compartments, 25 and 27 can be readily cleaned/out by opening the door 37 and removing thecap 36.

hen a fire is to be built or initially started; in, the furnace, the check damper 38 is closedan'dthe damper .31 is swung upwardly to close the passage 29 and open that 28. The. smoke will then pass directly through thebox 2l from the pipe 10 to that 35 as it can escape from the compartment 26 through the passage 2S'into the chamber 25. When the fire is burning properly, one will turn down the damper to close the passage 28 and open that 29 at which time the smoke or, products of combustion will pass up the pipe 10 into the compartment 26, through the passage '29 into the compartment 27, from the compartment 27 throughone of the series of tubes forwardly to'the passage 17 from the passage 17 rearwardly through the other series of tubes to the compartment 25 andfrom the compartment 25- directly throughthe outlet 33 to the pipe 35. The check damper 38 can of course be regulated as experience dictates. i V 'I have'found that by circulating the hot gasesin the manner just described through the tubes, I save a great deal of heat which would otherwise be lost in the chimney and nace comprising a box interiorly divided to r provide an entry compartment, an intermediate compartment. and an outlet compart ment, .flue pipes connecting the intermediate compartment. with the outlet compartment andextending into the upper part of the furnace, a smoke pipe leading the products of combustion from the furnace to the entry compartment, a flue pipe communicating with'the outlet compartment and leading to that by so doing, I'materially increase: the i the chimney and damper controlled passages between the entryv compartment andthe other compartments.

2. A heat economizer for, a hot air furnace comprisinga box exterior to. thefurnace and interiorly divided to provide an 5,

entry chamber, anintermediate chamber and an outlet chamber. andhaving a smoke passage connecting the inlet chamber with the intermediate chamber. and a smoke passage 7 connecting the entry chamber with the outlet,

chamber, a series of circulating pipes connecting the intermediate" chamber with the outlet chamber, said pipes extending horizontally across the furnace within the upper part thereof, a pipe leading the products of combustion from the furnace to, the. inlet compartment, a pipe connecting the outlet compartment with the chimney and a damp er for selectively closing one or other of the passages aforesaid.

3. A heat economizer for a hot air furnace comprising a ring insertible in the upper part of the outer casing of the furnace, diametrically opposing head plates carried by said ring, two sets of tubes connecting the head plates and extending across the upper part of the furnace, a passage connecting the ends of the sets of tubes at the front side of the furnace, a box exterior of the furnace and interiorly divided to provide an inlet compartment, an intermediate compartment and an outlet compartment, said intermediate compartment being in direct communication With the rear ends of one set of tubes and said outlet compartment being in direct communication with the rear ends of the other set of tubes, a pipe leading'the products of combustion from the furnace to the inlet compartment, a pipe connecting the outlet the furnace caslng, I by sald ring I and extending transversely of the furnace, said smoke passage connecting the inlet comcompartment with the chimney,. a

partment with the intermediate compart-' ment, a smoke passage connecting the inlet compartment with the outlet compartment and a damper for selectively controlling the across the upper part hot air fur- I sets of pipes being inter'connectedat oneqend and means for selectively passing theproducts of combustion from the furnace through said sets of pipes prior to their escaping to the chimney.

Signed at Winnipeg, this 11th day of J anuary, 1928. g r

. CLIFFORD LUSH; 

